Here are some great resources that can help you learn more about technology, which includes web accessibility, proper HTML markup, and other aspects of web design and development.

Treehouse (Basic $25/mth)

Treehouse is an online, self-paced learning platform for technical subjects, business, and more.

CodeAcademy (Free)

CodeAcademy is another platform for coding tutorials.

Lynda (Starts at $25 for 1 Month)

Lynda is the leader of technical online education with an extensive track record and some of the most experienced instructors in the industry.